.TH "QwtMagnifier" 3 "Wed Jan 2 2019" "Version 6.1.4" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtMagnifier \- \fBQwtMagnifier\fP provides zooming, by magnifying in steps\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_magnifier\&.h>\fP
.PP
Inherits QObject\&.
.PP
Inherited by \fBQwtPlotMagnifier\fP\&.
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBQwtMagnifier\fP (QWidget *)"
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.RI "virtual \fB~QwtMagnifier\fP ()"
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.RI "Destructor\&. "
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.RI "QWidget * \fBparentWidget\fP ()"
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.RI "const QWidget * \fBparentWidget\fP () const"
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.RI "void \fBsetEnabled\fP (bool)"
.br
.RI "En/disable the magnifier\&. "
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.RI "bool \fBisEnabled\fP () const"
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.RI "void \fBsetMouseFactor\fP (double)"
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.RI "Change the mouse factor\&. "
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.RI "double \fBmouseFactor\fP () const"
.br
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.RI "void \fBsetMouseButton\fP (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)"
.br
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.RI "void \fBgetMouseButton\fP (Qt::MouseButton &, Qt::KeyboardModifiers &) const"
.br
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.RI "void \fBsetWheelFactor\fP (double)"
.br
.RI "Change the wheel factor\&. "
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.RI "double \fBwheelFactor\fP () const"
.br
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.RI "void \fBsetWheelModifiers\fP (Qt::KeyboardModifiers)"
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.RI "Qt::KeyboardModifiers \fBwheelModifiers\fP () const"
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.RI "void \fBsetKeyFactor\fP (double)"
.br
.RI "Change the key factor\&. "
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.RI "double \fBkeyFactor\fP () const"
.br
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.RI "void \fBsetZoomInKey\fP (int key, Qt::KeyboardModifiers=Qt::NoModifier)"
.br
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.RI "void \fBgetZoomInKey\fP (int &key, Qt::KeyboardModifiers &) const"
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.RI "Retrieve the settings of the zoom in key\&. "
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.RI "void \fBsetZoomOutKey\fP (int key, Qt::KeyboardModifiers=Qt::NoModifier)"
.br
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.RI "void \fBgetZoomOutKey\fP (int &key, Qt::KeyboardModifiers &) const"
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.RI "Retrieve the settings of the zoom out key\&. "
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.RI "virtual bool \fBeventFilter\fP (QObject *, QEvent *)"
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.RI "Event filter\&. "
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.SS "Protected Member Functions"

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.RI "virtual void \fBrescale\fP (double factor)=0"
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.RI "virtual void \fBwidgetMousePressEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetMouseReleaseEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetMouseMoveEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetWheelEvent\fP (QWheelEvent *)"
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.RI "virtual void \fBwidgetKeyPressEvent\fP (QKeyEvent *)"
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.RI "virtual void \fBwidgetKeyReleaseEvent\fP (QKeyEvent *)"
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.in -1c
.SH "Detailed Description"
.PP 
\fBQwtMagnifier\fP provides zooming, by magnifying in steps\&. 

Using \fBQwtMagnifier\fP a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction\&. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtMagnifier::QwtMagnifier (QWidget * parent)\fC [explicit]\fP"
Constructor 
.PP
\fBParameters:\fP
.RS 4
\fIparent\fP Widget to be magnified 
.RE
.PP

.SH "Member Function Documentation"
.PP 
.SS "bool QwtMagnifier::eventFilter (QObject * object, QEvent * event)\fC [virtual]\fP"

.PP
Event filter\&. When \fBisEnabled()\fP is true, the mouse events of the observed widget are filtered\&.
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\fBParameters:\fP
.RS 4
\fIobject\fP Object to be filtered 
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\fIevent\fP Event
.RE
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\fBReturns:\fP
.RS 4
Forwarded to QObject::eventFilter()
.RE
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\fBSee also:\fP
.RS 4
\fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtMagnifier::getMouseButton (Qt::MouseButton & button, Qt::KeyboardModifiers & modifiers) const"

.PP
\fBSee also:\fP
.RS 4
\fBsetMouseButton()\fP 
.RE
.PP

.SS "void QwtMagnifier::getZoomInKey (int & key, Qt::KeyboardModifiers & modifiers) const"

.PP
Retrieve the settings of the zoom in key\&. 
.PP
\fBParameters:\fP
.RS 4
\fIkey\fP Key code, see Qt::Key 
.br
\fImodifiers\fP Keyboard modifiers
.RE
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\fBSee also:\fP
.RS 4
\fBsetZoomInKey()\fP 
.RE
.PP

.SS "void QwtMagnifier::getZoomOutKey (int & key, Qt::KeyboardModifiers & modifiers) const"

.PP
Retrieve the settings of the zoom out key\&. 
.PP
\fBParameters:\fP
.RS 4
\fIkey\fP Key code, see Qt::Key 
.br
\fImodifiers\fP Keyboard modifiers
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetZoomOutKey()\fP 
.RE
.PP

.SS "bool QwtMagnifier::isEnabled () const"

.PP
\fBReturns:\fP
.RS 4
true when enabled, false otherwise 
.RE
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\fBSee also:\fP
.RS 4
\fBsetEnabled()\fP, \fBeventFilter()\fP 
.RE
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.SS "double QwtMagnifier::keyFactor () const"

.PP
\fBReturns:\fP
.RS 4
Key factor 
.RE
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\fBSee also:\fP
.RS 4
\fBsetKeyFactor()\fP 
.RE
.PP

.SS "double QwtMagnifier::mouseFactor () const"

.PP
\fBReturns:\fP
.RS 4
Mouse factor 
.RE
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\fBSee also:\fP
.RS 4
\fBsetMouseFactor()\fP 
.RE
.PP

.SS "QWidget * QwtMagnifier::parentWidget ()"

.PP
\fBReturns:\fP
.RS 4
Parent widget, where the rescaling happens 
.RE
.PP

.SS "const QWidget * QwtMagnifier::parentWidget () const"

.PP
\fBReturns:\fP
.RS 4
Parent widget, where the rescaling happens 
.RE
.PP

.SS "virtual void QwtMagnifier::rescale (double factor)\fC [protected]\fP, \fC [pure virtual]\fP"
Rescale the parent widget 
.PP
\fBParameters:\fP
.RS 4
\fIfactor\fP Scale factor 
.RE
.PP

.PP
Implemented in \fBQwtPlotMagnifier\fP\&.
.SS "void QwtMagnifier::setEnabled (bool on)"

.PP
En/disable the magnifier\&. When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed\&.
.PP
\fBParameters:\fP
.RS 4
\fIon\fP true or false 
.RE
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\fBSee also:\fP
.RS 4
\fBisEnabled()\fP, \fBeventFilter()\fP 
.RE
.PP

.SS "void QwtMagnifier::setKeyFactor (double factor)"

.PP
Change the key factor\&. The key factor defines the ratio between the current range on the parent widget and the zoomed range for each key press of the zoom in/out keys\&. The default value is 0\&.9\&.
.PP
\fBParameters:\fP
.RS 4
\fIfactor\fP Key factor 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBkeyFactor()\fP, \fBsetZoomInKey()\fP, \fBsetZoomOutKey()\fP, \fBsetWheelFactor\fP, \fBsetMouseFactor()\fP 
.RE
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.SS "void QwtMagnifier::setMouseButton (Qt::MouseButton button, Qt::KeyboardModifiers modifiers = \fCQt::NoModifier\fP)"
Assign the mouse button, that is used for zooming in/out\&. The default value is Qt::RightButton\&.
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\fBParameters:\fP
.RS 4
\fIbutton\fP Button 
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\fImodifiers\fP Keyboard modifiers
.RE
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\fBSee also:\fP
.RS 4
\fBgetMouseButton()\fP 
.RE
.PP

.SS "void QwtMagnifier::setMouseFactor (double factor)"

.PP
Change the mouse factor\&. The mouse factor defines the ratio between the current range on the parent widget and the zoomed range for each vertical mouse movement\&. The default value is 0\&.95\&.
.PP
\fBParameters:\fP
.RS 4
\fIfactor\fP Wheel factor 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmouseFactor()\fP, \fBsetMouseButton()\fP, \fBsetWheelFactor()\fP, \fBsetKeyFactor()\fP 
.RE
.PP

.SS "void QwtMagnifier::setWheelFactor (double factor)"

.PP
Change the wheel factor\&. The wheel factor defines the ratio between the current range on the parent widget and the zoomed range for each step of the wheel\&.
.PP
Use values > 1 for magnification (i\&.e\&. 2\&.0) and values < 1 for scaling down (i\&.e\&. 1/2\&.0 = 0\&.5)\&. You can use this feature for inverting the direction of the wheel\&.
.PP
The default value is 0\&.9\&.
.PP
\fBParameters:\fP
.RS 4
\fIfactor\fP Wheel factor 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBwheelFactor()\fP, setWheelButtonState(), \fBsetMouseFactor()\fP, \fBsetKeyFactor()\fP 
.RE
.PP

.SS "void QwtMagnifier::setWheelModifiers (Qt::KeyboardModifiers modifiers)"
Assign keyboard modifiers for zooming in/out using the wheel\&. The default modifiers are Qt::NoModifiers\&.
.PP
\fBParameters:\fP
.RS 4
\fImodifiers\fP Keyboard modifiers 
.RE
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\fBSee also:\fP
.RS 4
\fBwheelModifiers()\fP 
.RE
.PP

.SS "void QwtMagnifier::setZoomInKey (int key, Qt::KeyboardModifiers modifiers = \fCQt::NoModifier\fP)"
Assign the key, that is used for zooming in\&. The default combination is Qt::Key_Plus + Qt::NoModifier\&.
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\fBParameters:\fP
.RS 4
\fIkey\fP 
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\fImodifiers\fP 
.RE
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\fBSee also:\fP
.RS 4
\fBgetZoomInKey()\fP, \fBsetZoomOutKey()\fP 
.RE
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.SS "void QwtMagnifier::setZoomOutKey (int key, Qt::KeyboardModifiers modifiers = \fCQt::NoModifier\fP)"
Assign the key, that is used for zooming out\&. The default combination is Qt::Key_Minus + Qt::NoModifier\&.
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\fBParameters:\fP
.RS 4
\fIkey\fP 
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\fImodifiers\fP 
.RE
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\fBSee also:\fP
.RS 4
\fBgetZoomOutKey()\fP, \fBsetZoomOutKey()\fP 
.RE
.PP

.SS "double QwtMagnifier::wheelFactor () const"

.PP
\fBReturns:\fP
.RS 4
Wheel factor 
.RE
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\fBSee also:\fP
.RS 4
\fBsetWheelFactor()\fP 
.RE
.PP

.SS "Qt::KeyboardModifiers QwtMagnifier::wheelModifiers () const"

.PP
\fBReturns:\fP
.RS 4
Wheel modifiers 
.RE
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\fBSee also:\fP
.RS 4
\fBsetWheelModifiers()\fP 
.RE
.PP

.SS "void QwtMagnifier::widgetKeyPressEvent (QKeyEvent * keyEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a key press event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fIkeyEvent\fP Key event 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtMagnifier::widgetKeyReleaseEvent (QKeyEvent * keyEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a key release event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fIkeyEvent\fP Key event 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtMagnifier::widgetMouseMoveEvent (QMouseEvent * mouseEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a mouse move event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fImouseEvent\fP Mouse event 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, 
.RE
.PP

.SS "void QwtMagnifier::widgetMousePressEvent (QMouseEvent * mouseEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a mouse press event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fImouseEvent\fP Mouse event 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseMoveEvent()\fP 
.RE
.PP

.SS "void QwtMagnifier::widgetMouseReleaseEvent (QMouseEvent * mouseEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a mouse release event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fImouseEvent\fP Mouse event
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseMoveEvent()\fP, 
.RE
.PP

.SS "void QwtMagnifier::widgetWheelEvent (QWheelEvent * wheelEvent)\fC [protected]\fP, \fC [virtual]\fP"
Handle a wheel event for the observed widget\&.
.PP
\fBParameters:\fP
.RS 4
\fIwheelEvent\fP Wheel event 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
